Mold for casting peripherally-closed relief-engraved printing-cylinders.



E. T. NEBEN,, MOLD FOR CASTING PERIPHERALLY CLOSED,REL|EF ENGRAVED PRINTING CYLINDERS,

APPLICAIION FILED AUG-2, I916- Patented Apr. 2,1918.

WEED STATEd PATENT FFQE.

EMIL T. NEIBEN, OF RIDGEWOOD, NEW JERSEY, ASSIGNOR, BY MESNE ASSIGNMENTS, TO NEBEN MAN UFAC'IURIN G COMPANY, A CORPORATION OF NEW JERSEY.

MOLD non CASTING PERIPHERALLY-CLOSED RELIEF-ENGRAVED PRINTING- CYLINDERS.

Specification of Letters Patent.

Application filed August 2, 1916. Serial No. 112,642.

To all whom it may concern:

Be it known that I, EMIL T. NEBEN, a citizen of the United States of America, and a resident of Ridgewood, county of Bergen, State of New Jersey, have invented certain new and useful Improvements in Moldsfor (lasting Peripherally-Closed Relief-Engraved Printing-Cylinders, of which the following is a specification.

This invention has reference to novel molds for casting peripherally closed, relief engraved printing cylinders to be used in the art of continuous rotary printing.

Heretofore relief engraved printing cylinders could not conveniently and cheaply be produced in any size of tubular form as uninterrupted all closed complete cylinders for continuous rotary printin An open longitudinal slot was always le t in the former cylinders. Such open cylinders were used only for printing single pages where a blank top and bottom space was left orv for other printed matter which did not require continuous rotary printing and therefore are very much limited in the production of desirable designs. If a cylinder with a relief engraved surface portion is cast in a tubular casting mold on a core or tube-the cooling metal shrinks upon the core so tight that it is impossible to remove it from the casting mold. An outer mold of course may be destroyed or taken off but the inner core of the tubular casting mold can not be removed and the engraved cylinder can not be separated therefrom for the reason that the stereotype metal shrinks upon the inner core when cooling, therefore it is impossible to remove the relief engraved cylinder from the inner core of the casting mold.

A complete copper roll certainly may be engraved by hand or milled in by machinery in intaglio but suchprocess is ver' limited to certain designs only and prohibitive as to cost for many designs that can not be accomplished by the well known intaglio process.

The resent invention has for its purpose to pro uce uninterrupted, tubular, peripherally closed, relief engraved, printing cylinders which present well recognized advantages but so far could not have been produced by easy and chea methods. The former cylinders have a ree open slot or space where printing can not be done and Patented Apr. 2, 1918. Y

therefore such cylinders can not be used for continuous rotary commercial printing in silk works, oil cloth printing shops and wall paper factoriesfor printing in relief from cylinder print rolls.

For the purpose of overcoming the described defects and broadening the field for relief printing I have produced a peripherally closed, relief engraved, printing cylinder which can be used for continuous printing upon large or small webs of silk, cotton, oilcloth, wall paper, fancy pa er and the like taking in a vast scope of ne commercial and art printing. This is accomplished by casting the design in a complete cylinder from a matrix adjusted in a tubular mold provided inside with an expansible core. For the purpose of being able to remove the mold from the cylinder casting and use it over again the said mold is divided into a plurality of curved sections, say four. Some of the sections are hinged to the adjoining sections and provided with looking devices. The curved sections form a complete tubular mold. Such tubular sections are hinged together and actually form doors which may easily be assembled to form a tubular mold and locked. After the cylinder castin has been made the locks may be release and the doors opened so that the outer mold may be removed from the cast relief engraved printing cylinder. The expanding arbor or core within the cast cylinder is then released and removed.

The design is produced in line or half tone engraving on a fiat surface from which a common matrix is made such as used for instance as paper matrices employed in making stereotypes. A paper matrix is produced and cut so that the designs or patterns match perfectly when in tubular form, then the paper matrix is curved and placed into the tubular mold with the face toward the inner expanding arbor of the mold.

Within the divided mold there is the expansible core or arbor which is placed centrally in the tubular casting mold and is made substantially of the construction described in Letters Patent granted to Wood assor Pat. No. 1,056,480, March 18, 1913, for expanding core or arbor. The divided mold is so constructed as to allow molten metal to enter from the bottom upward,

When the matrix has been adjusted in the tubular mold and the expansible core set therein the molten metal is forced up from the bottom until the mold is filled whereby the engraved cylinder in relief is created. The molten metal is introduced from the bottom for the purpose of conveniently expelling the air bubbles and thereby producing a clean and sharp casting free from dirt and air holes.

When the casting has thoroughly cooled 0E and set the outer mold is removed as hereinbefore described and the expanding core'within released by decreasing its diameter from the original size upon which the engraved cylinder was cast. Thus the cast engraved cylinder is free from both the outer mold and the inner expanding core or arbor. The cast cylinder produced in the described manner is not inseparably shrunk on the inner core which is expansible and may be reduced to a small diameter. The cast free cylinder being in an all closed uninterrupted form of relief engraved cylinder is now ready for any rotary printing press.

One of the chief and all important advantages of this novel peripherally closed tubular printing in relief from a cylinder is the great speed in the production of print ed goods, and in the saving of time in preparing the printing cylinder in the casting mold. Formerly it required hours to make up a printing form on the press ready to print, by these cylinders it takes but minutes.

In order to render the invention entirely clear reference is had to the accompanying drawing in which:

Figure 1 represents in longitudinal central section a mold for producing cast, peripherally closed, relief engraved printmg cylinders, showing certain parts in elevation and embodying in desirable form the present improvements.

Fig. 2 illustrates this mold in vertical elevation.

Fig. 3 is a top plan view of the same.

Fig. 4 indicates a cast, peripherally closed, relief engraved printing cylinder.

Similar characters of reference denote like parts in all the figures.

In the drawing a represents the outer mold which forms a cylinder having a-bottom 6. The cylindrical mold a is composed of four curved sections a a a a as best shown in Fi '3. These curved sections are united by hlnges c, 0 0 and the sections a a are provided with locks d of any suitable construction. The locks are provided each with a handle al and may easily be opened and closed. The bottom 6 of the mold has two openings through which pipes ej pass. These pipes are connectedby a pipe 9 from the center'of which a pipe it printing cylinder.

leads to the vessel containing the molten metal. On the inner surface of the mold a paper matrix 71 is located with the design thereon toward the interior of the mold. The design is properly matched at its joining edges. As herein stated the matrix is made preferably like the paper matrices employed in making stereotypes.

Within the mold there is the expanding core or arbor composed of four curved sec tions j, 71:, Z, m with spaces between 9' Z9, Z m These four sections or shell pieces, by virtue of the spaces between them may be expanded and contracted. To render this clear the operation of the Wood expanding core may be shortly reviewed. A tube 11. passing through the device has at each end a head 0 and a iournal plug fits into each head 0. An adjusting head q is mounted upon the tube 01. and held in position by a collar 1 The broadened top portion of the adjusting head 9 is provided with a plurality of openings 8 which openings or spanner holes are adapted to receive a spanner wrench whereby the adjusting head 9 may be rotated. The shell pieces are in connection with the adjustable head. If

the head is rotated in one direction the shell pieces expand and if rotated in the other direction the shell pieces contract.

In order to cover the spaces 3' Z, m between the shell pieces of the expansible core a paper tube t is slipped onto the shell pieces of the core and thecore is then expanded so as to rest tightly against the paper tube. As seen from Fig. 1 of the drawing there is a distance between the paper matrix i and the paper tube 25 and the space between the tube and matrix is the space to be filled up by the molten metal to form the cast, peripherally closed, relief engraved printing cylinder. The pipes e, f through which the molten metal is introduced into the mold are so arranged that they issue right into this space. When the molten metal rising from the bottom up has filled the space between the matrix and the paper tube-a cast, peripherally closed, relief engraved printing cylinder u is formed. As soon as the cast printing cylinder has cooled off and completely set the locks d outside on the mold are released and the sections or doors forming the outer mold opened. Now the mold is taken away and the matrix removed exposing the cast, relief engraved expanding core the spanner wrench is applied and the core contracted whereupon it may easily be taken out of the cast printing cylinder. The paper-tube t then is taken out leaving the cast, relief engraved print- 111;); cylinderready to be applied to any retary printing press.

Tt is evident that the cast, relief engraved printing cylinder, closed around its entire In order to remove the circumference and produced in one piece can be used for continuous printing wit iout any interruption until a roll or web of silk, cotton, oilcloth, wall paper, fancy paper and the like has passed through the rotary printing press. A new roll or web may then be inserted and the rotary printing continued in the described manner. All parts of the mold are used over and over again and as the design is cast in the complete cylinder from a matrix adjusted in the tubular mold a great variety of cast. all closed rotary printing cylinders may be roduced from one mold. A different printmg cylinder always results from a different matrix with different designs thereon. Thus one mold of standard size ma be used for the production of a great variety of cylinders because the only part used in the mold which changes is the matrix with the designs thereon.

For exceptionally large or small work molds of the same construction are used which are lar e or small as required whereby large or small cast, relief engraved printing cylinders are produced which are peripherally closed and adapted for continuous rotary printing.

I claim as my invention 1. A mold for producing cast, peripherally closed, relief engraved printing cylinders for continuous rotary printing comprising a divided tubular outer mold with a separate bottom and open at the top, an expansible core centrally within the mold, means on the inner surface of said mold adapted to produce a completely closed outer surface, so arranged that a space remains between said means and core, and means for introducing molten metal into said space from the bottom upward.

2. A mold for producing cast, peripherally closed, relief engraved printing cylinders for continuous rotary printing comprising a tubular outer mold composed of a plurality of curved sections hinged together, locks on some of said sections, a separate bottom on said mold, an expansible core centrally within the mold, a tubular matrix on the inner surface of the mold, means on the core when expanded to produce a completely closed outer surface, so arranged that a space remains between said matrix and means, and means for introducing molten metal into said space from the bottom upward.

3. A mold for producing cast, peripherally closed, relief engraved printing cylinders for continuous rotary printing comprising a tubular outer mold composed of a plurality of curved sections, a separate bottom on said mold, an expansible core centrally within the mold, a tubular matrix mounted on the inner surface of the mold, a paper tube on the core when expanded, so arranged that a space remains between said matrix and tube, and means for introducing molten metal into said space from the bottom upward.

4. A mold for producing cast, peripherally closed, relief engraved printing cylinders for continuous rotary printin comprising a tubular outer mold compose of a plurality of curved sections, a separate bottom on said mold, an expansible core centrally within the mold, a tubular matrix mounted on the inner surface of the mold, a paper tube on the core when expanded, so arranged that a space remains between said matrix and tube, and a pipe arrangement for intr0- ducing molten metal into said space from the bottom upward.

5. A mold for producing cast, peripherally closed, relief engraved printing cylininders of various thickness for continuous rotary printing comprising a removable tubular outer mold, a separate bottom, a variably expansible core centrally within the said mold, a tubular matrix on the inner surface of the mold with the designs thereon toward the interior, a smooth paper tube on the core when expanded, and a pipe arrangement for introducing molten metal into the mold between the matrix and paper tube from the bottom upward.

6. A mold for producing cast, peripherally closed, relief engraved printing cylinders of various thickness for continuous rotary printing comprising a removable tubular outer mold, a variably expansible inner core, and means between said mold and core for producing a peripherally closed, east, relief engraved printing cylinder.

Signed at New York, N. Y., this 31 day of July, 1916.

EMIL T. NEBEN.

Witnesses:

HERMAN J. RUBENs'rEIN, LILLEY E. SCHMIDT. 

